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Ultrathin Colloidal Cesium Lead Halide Perovskite Nanowires

CsPbBr3 ultrathin NWs with uniform diameter around 2.2 nm, showing single crystalline nature and bright blue photoluminescence.

Scientific Achievement
Highly uniform single crystal ultrathin CsPbBr3 nanowires with diameter of 2.2 nm and length up to several microns were successfully synthesized and purified using a catalyst-free colloidal method.

Significance and Impact
These bright ultrathin nanowires can serve as a model system to study strong quantum confinement effects in a one-dimensional halide perovskite system.

Research Details

  • Developed a stepwise purification method to improve the purity of the ultrahin nanowires to over 90%, by using different volumes of ethyl acetate as antisolvent.
  • Ultrathin CsPbBr3 nanowires show uniform diameter, bright photoluminescence, and strong quantum confinement effect.
  • Strong photoluminescence can be tuned from 360 - 580 nm while preserving morphology.

D. Zhang, Y. Bekenstein, A.B. Wong, A.P. Alivisatos, P. Yang J. Am. Chem. Soc. 138 , 13155- 13158 (2016), DOI: 10.1021/jacs.6b08373